Cylinder cock



May 8, 1934. H. J. MQLAIN Err AL CYLINDER COCK Filed Feb. 15, 1932 F7//VVEW7'0/P$ Harry I M L in H, Tr: v0! MLLain 5 y Ml Patented May 8,1934 sr res PATENT OFICE CYLINDER COCK Application February 15, 1932,Serial No. 592,893

1 Claim.

5 acter, our improvement involving the use of a slide valve controllingthe escape of water and steam from the cock casing and an actuatingpiston shiftable under variations between the pressure in the cockcasing and that of a steam supply 1 acting upon the opposite face of thepiston and shiftable also when steam is cut Off by resilient meansacting to shift the piston and valve to valve opening position. Theseand other features of our invention will be best understood as describedin connection with the drawing, in which we have illustrated ourcylinder cock in what we believe to be its best form, and in whichFigure 1 shows our improved cock in vertical section, and

Figure 2 is a plan view of the valve and of the interengaged portion ofthe spindle, indicated in dotted lines.

A indicates the cock casing, which may be attached to the enginecylinder in any convenient way. As shown, it is provided with a threadedupper end for such attachment. A chamber which when the cock is attachedto an engine cylinder is in free communication therewith is formed inthe casing, as indicated at A As shown, a lateral extension A of thecasing is provided, which is internally threaded and. into which screwsa cylinder B, which is in free communication with the chamber of thecasing at one end and is provided with a steam inlet B at its outer end,5 by which it can be connected with a steam pipe leading from the boilerand having of course a control valve in the cab, as is usual in suchdevices. The steam pipe with its boiler and valve connection are notshown and may, of course, be of any usual and obvious construction. C isa cylindrical socket piece secured in the wall of the casing opposite toand in alignment with the cylinder, said socket piece being shaped so asto provide an annular circumferential wall C to afford a seat for aspring. D is a closure secured to the lower part of the casing A, asshown by screwing on to the threaded lower end of the casing A. A port Dis formed through the top of this closure, said port being incommunication with an outlet passage D which is, as shown, directedlaterally so that steam and water escaping from the casing will bedelivered in a direction to give the least possible trouble. The uppersurface of the closure D forms a flat slide Valve seat D surrounding theoutlet port D E is a slide valve seated on the valve seat D and havingextending from its upper surface two prongs, as indicated at E E Twosuch prongs should be provided and so located as to extend one on eachside of the piston spindle, to be described, so as to align the valvewith the spindle, said prongs being also spaced to engage with collarson the spindle, to be described. A spring socketE is also provided, asshown on the top of the valve, to support a coiled spring F, the upperend of which is in contact with the piston spindle. G is a pistonworking in the cylinder B, having as shown a spindle extension Gextending across the chamber A and fitting in the cylindrical socket C.Extending from the spindle G are collars G G located so as to engage theprongs E extending from the valve. As shown, the rear collar also servesas an abutment for a spring H, the other end of which extends around theend of the socket piece and rests against the wall C G is a restrictedpassage extending from end to end through the piston G. When steam isshut off from the cylinder sufficient steam will pass through thisrestricted passage to prevent freezing of water which may have collectedin the chamber A or connected parts. It will also be obvious that thispassage may to a certain extent be utilized to facilitate the driftingof a locomotive.

It will be obvious that the action of the spring H will tend to shiftthe spindle and connected piston and the interengaged slide valve topositions in which the valve opens the port D It will also be obviousthat the engine cylinder pressure will at all times exist in the chamberA and will tend to shift the piston spindle and valve to position toopen the port. It will also be obvious that steam pressure admittedthrough the passage B will tend to shift the piston and connected partsso as to close the port D and as full boiler pressure is normallyadmitted to the cylinder this pressure will normally be effective toshift the piston to the position shown in the drawing and to close thevalve. The effective areas of the opposite ends of the piston may ofcourse be regulated in any convenient way to secure the opening andclosing of the valve under any contemplated conditions. As shown, theeffective area of the inner face of the piston is smaller than that ofthe outer end of the piston by reason of the extension from this face ofthe piston of the spindle G the outer end of which fits in the cylindersocket piece C. It will be obvious that the piston will move outward andopen the valve whenever steam is cut off from the port B and it willalso be obvious that whenever from any cause the pressure in the chamberA acting on the inner face of the piston exceeds the effective pressureacting on the outer face of the piston that the piston will moveoutward, opening the valve and permitting the escape of any water whichmay have accumulated in the chamber A or in the engine cylinder.

Our construction involving the use of the slide valve E for opening andclosing the outlet port of the casing has distinct advantages in thatthis type of valve may be relied upon to maintain contact with its seatand to open and close its control port with precision and certainty. Thevalve is held against its seat by the pressure of the spring F and bythe pressure existing in the chamber A of the casing, itsinterengagement with the spindle and its collars being such as to couplethe valve with the spindle for longitudinal movement and for properalignment with the spindle.

' The closure D should be connected with the casing A in such manner asto be angularly adjustable in its final position, thus permitting thedirection of the outlet D to the most desirable position. As shown, thisis effected by making the union between the closure and the casing ascrew union and it will be obvious that the angular adjustment of theclosure in no wise affects the seating and movement of the valve E.

While we have described our device as a cylinder cook, it will beobvious that it can be attached with advantage to any part of the steamline in which water may accumulate and from which the water should beeliminated at will.

Having now described our invention, what we claim as new and desire tosecure by Letters Patent, is:

A cylinder cock comprising a casing attachable to the end of an enginecylinder having a chamber adapted to be in free communication with saidcylinder, a horizontally disposed cylinder extending from the side ofthe casing, connected at one end to the casing chamber and connectableto a source of steam supply at its other end; a detachable closure forthe lower end of the casing chamber provided with an outlet portextending through said closure and having a slide valve seat upon itsupper surface surrounding said outlet port, a piston working in thecylinder connected with the casing chamber having an extensionprojecting into the casing chamber and extending over the valve seat, aslide valve working on the slide valve seat of the closure, movablebetween a position in which it opens the outlet port from thecasing-chamber and a position in which it closes said outlet port andprevents the escape of fluid from the casing chamber, means looselyconnecting the slide valve to the piston extension so that the valvewill move with the piston extension, whereby an inward movement of thepiston shifts the slide valve to close the outlet port and an outwardmovement of the piston shifts the valve to open the outlet port andresilient means acting on the piston to shift it to a position to openthe valve.

HARRY J. MCLAIN. H. TREVOR MCLAIN.

